Mercury-meter.



F HOLDEN.

MERCURY METER. APPLICATION FILED MARJL), 1907.

gggg ggkg Patented June 15,1909.

WIT. EYE/ENTER FRANK HUL DEN AT TY:

UNITED STATES FRANKHOLlDEN, or Lennon,

" CORPORATION- AT NT... OFFICE.

ENGLAND, A'SSIGNORTQ GEN RAL ELECTRIC COMPANY, A

OF NEW YORK.

" MERCURY-Marne.

Specification of Letters Patent.

. retente'a'rune 15,1909.

Application filed. reach is, raw.- Serial No. 368,288.

into the chamber having a portion of capil-: lary cross-section, so as to produce proper retardation of mercury-flow, and a registering device included in the duct. One form of registering device disclosed consisted of a paddle-wheel, rotated by the flow of the mercury and geared to-the recording mechan- My present invention consists in an improvement in the construction of the paddlewheel. v

When a paddle-wheel of the usual construction is employed, the inlet from the-duct to the wheel varies in its eifective size with variation in position of the wheel. ,When a paddle-is directly opposite the inlet, the area of the inlet is reduced, and owing to surface 7 tension of the mercury, the mercury flow is registration on 'ght loads.

retarded. This reduces-a sli ht error .in the fiy my resent invention this source of error on li ht oads is avoided by so arranging the padd e-wheel as to present a free opening fromthc duct into the wheel in any position of the paddles relative to the inlet to the wheel. More specifically stated, I arrange the wheel with two sets of paddles separated by a partition, and staggered with relation to each other, so, that .when a paddleof one set is opposite the inlet, 'a space etween adjacent pa les of the other set is opposite the inlet, so that a free opening into the wheel is provided in any position'o'f the wheel. r

My invention will best be understood by reference to the accompanying drawings, in which- Figure 1 shows a front elevation of a mercury meter arran ed inaccordancewith my invention; Fi 2 s owsa side elevation of the paddle-wheel ox; Figs. 3-and 4 show 011-.

end and side viewsof the paddlewheel Fig.5 shows a view in perspective of the mercurychamber; the inclo'sing portion being shown-indbtted lines.

in the drawings, A represents the field magnet, which, for a Coulomb meter, may be a permanent magnet, as indicated, and for a tential winding.

B represents a casing-formed of insulating blocks, between which is athin cruciform chamber C-,--shown in Fig. 5. l The poles of ma net A extend throu h the walls ofchu J; her 'to opposite sidesoi chamber 0 as Shown in Fig. in dotted lines. D D represent ihe current-leads to the mercuryin this space.

ing into t emercu-ry chamber C, andforming, with the paddle-Wheel casin F, a closed has a portion of, capillary cross-section, as

pro er retar ation of mercury-flow. The pa dle-wheel G ismounted ifn the casing'F. The shaft of the wheel projects through the casing, and carries a gear' 9," by means of which it is connected to any suitable form of recording mechanism.

Theinstrument, as thus far described, is

plication, above referred to, but the-paddle my present invention, arranged as shown in wheel comprises two sets of paddles separated bya partition, the paddles ofthe two other. Consequently, when a paddle of either set is opposite the inlet to the wheel, a space between paddles of theothcr set is opposite the inlet, so that a free opening into the wheel is provided in any position of the Wheel. The paddles and partition fit the interior of casing F closely enough to prevent enough to permit free'rotation of the wheel.

WhatJI claim as new and desire to secure .by Letters Patent of the United States, is, 1. The combination in a mercury meter, of a magnetic'field, a mercury chamber in said field, current leads to the mercury in said chamber, a closed duct having its 'endsopening. into said chamber, and a paddle-wheel included in said duct having 'itspaddlesfarranged in a plurality'of sets separated bya wattmeter would be provided with a '00- E E re resent tubes with-their ends openthe same as that disclosed in my former apleakage 'of mercury past them but looselyv duct'for the mercury. One of t e tubes E shown in Fi -.-1, in'orderto produce the wheel, instead of being constructed of a single set of paddles, is, in accordance with Figs. 3 and 4. As shown in these figures, the

sets being staggered with regard to each partition at righterigles to the axis, the pad dles in said sets being relatively staggered.

2. The combination in a mercury meter, of a magnetic-field, a mercury chamber insaid 'lield, current loads to the mercury in. said chamber, a closed duet having its ends opening ieto said ohamber,and a paddlewheel included in said duet having its paddles arian ed with the spaoe between paddles at one part the Wi'lGGl line with a paddle on another part of the Wheel, and a partition partitions beirig line with a paddle on the other sid e-of the partitions.

t. The combination in a mercury meter, of

eeaeee a magnetic field, a mercury chamber in said field, current leads to the mercury in said ehamber, a closed duet hayingits ends opening into said chamber, and a paddle-wheel included in said duct arranged in two sets separated by a partition at right-angles to the axis of the wheel, the space betweerfthe paddles in one set being in line with a paddle of the other set.

5. The combination in a mercury meter, of a magnetic field, a mercury chamber in said field, current loads to the mercury in said chamber, aolosed duct having" its ends opeiiing into said chamber, and a paddle-wheel inoluded said duct having radial paddles arranged in two sets separated by a partition at right-angles to the axis, the paddles in one set being in line with the biseotors of the angles between thepaddles in the other set,

In Witness whereof, l have hereunto set 'my hand this siXth day of March, 1907 FRAN K HOLDE N JJitnesss: u v

- H. D. JA EsoN,

A NU'TTZNG.

having radial paddles 

